Is This Malicious Tampering?

The trinity is found and presupposed in lots of places in the new testament. But for one reason or another, somebody got creative and added this line. To me, this is an extremely profound difference. An example from the book of acts. There are a handful of manuscripts in the western this asia, minor tradition that have an extra line to the story of stephen. And so it may bug you that some scribe put that in there again. So week a debate similar to jeremiah. Is this malicious tampering? Are we introducing an idea that not found anywhere else in the new Testament?